US3975638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device for localization of ionizing particles
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1974-10-29
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Granted: 1976-08-17
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Expires: 1994-10-29
Abstract
Abstract An array of needle point anodes has its points uniformly spaced from a sheet cathode. Ionization occurring in an ionizable medium causes electron multiplication in the high electric field of the nearest anode point. A semiconductor solid may be the ionizable medium, instead of the usual gaseous or liquified rare gas. The pulse count rate is individually measured for each anode, or for each cathode segment when the anodes are connected together and a segmented cathode is used, to locate the trajectory and measure the flux of ionizing particles.
Inventors
- 👤 Claude Grunberg
- 👤 Jean Le Devehat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:11
CPC Classifications
H; H01; H01J; H01J47/00; H01J47/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
216 words
A detector for two-dimensional localization of the trajectory of ionizing particles comprising: a multiplicity of cathode electrodes in the form of mutually insulated separate sheet segments of conducting material of such shape and disposition that if they were extended so as to make contact with each other, they would form a continuous sheet; an anode in the form of a two-dimensional array of elongated pointed elements electrically connected together and having their points respectively opposite said cathodes at a uniform spacing from the respective cathodes, the space between said anode and said cathodes being free of metallic obstructions; a chamber for maintaining an ionizable gas unobstructedly between said anode and said cathodes and between the elongated pointed elements of said anode for a substantial length thereof away from their points, said chamber being constructed so as to permit independent electrical connections to the respective cathodes and to said anode outside the chamber; an ionizable gas in said chamber; means for applying an electric potential of the order of a few thousand volts between said anode and said cathodes, and means, including impedances interposed between said cathodes, respectively, and said electrical potential applying means, for detecting the points of impact and of flux of ionizing particles by measuring the count rate of electrical pulses at each cathode.
Claim 2
Dependent Claim
216 words
A detector for two-dimensional localization of the trajectory of ionizing particles comprising: a multiplicity of cathode electrodes in the form of mutually insulated separate sheet segments of conducting material of such shape and disposition that if they were extended so as to make contact with each other, they would form a continuous sheet; an anode in the form of a two-dimensional array of elongated pointed elements electrically connected together and having their points respectively opposite said cathodes at a uniform spacing from the respective cathodes, the space between said anode and said cathodes being free of metallic obstructions; a chamber for maintaining an ionizable gas unobstructedly between said anode and said cathodes and between the elongated pointed elements of said anode for a substantial length thereof away from their points, said chamber being constructed so as to permit independent electrical connections to the respective cathodes and to said anode outside the chamber; an ionizable gas in said chamber; means for applying an electric potential of the order of a few thousand volts between said anode and said cathodes, and means, including impedances interposed between said cathodes, respectively, and said electrical potential applying means, for detecting the points of impact and of flux of ionizing particles by measuring the count rate of electrical pulses at each cathode.
Claim 3
Dependent Claim
31 words
A detector according to claim 1 in which the surfaces of said cathodes lie in a plane and in which the points of said anode are uniformly distributed in a plane.
Claim 4
Dependent Claim
122 words
A detector for two-dimensional localization of the trajectory of ionizing particles comprising: a cathode electrode in the form of a continuous sheet of conducting material; an ionizable semiconducting solid block adjacent one surface of said cathode; a multiplicity of anodes in the form of a twodimensional array of needles projecting in said semiconducting solid block and having their points uniformly spaced from said cathode; means for applying an electric potential of the order of a few thousand volts between said cathode and said anode, and means, including impedances interposed between said anodes, respectively, and said electric potential applying means, for detecting the points of impact and the flux of ionizing particles by measuring the count rate of electrical pulses at each anode.
Claim 5
Dependent Claim
122 words
A detector for two-dimensional localization of the trajectory of ionizing particles comprising: a cathode electrode in the form of a continuous sheet of conducting material; an ionizable semiconducting solid block adjacent one surface of said cathode; a multiplicity of anodes in the form of a twodimensional array of needles projecting in said semiconducting solid block and having their points uniformly spaced from said cathode; means for applying an electric potential of the order of a few thousand volts between said cathode and said anode, and means, including impedances interposed between said anodes, respectively, and said electric potential applying means, for detecting the points of impact and the flux of ionizing particles by measuring the count rate of electrical pulses at each anode.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |